FLOW FAILURE MECHANISM AFTER EARTHQUAKE PAYING ATTENTION TO THE PORE WATER MIGRATION

震后水流破坏机制关注孔隙水运移

基本信息

批准号：
13450190
负责人：
MOTOKI Kazuma
金额：
$ 5.57万
依托单位：
Tohoku University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2003
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-13450190/
关键词：
Seepage Failure Liquefaction Excess pore water pressure Progressive failure Hybrid test Lateral Spreading Failure of pile foundation Volumetric strain ハイグリット実験倒方流動

项目摘要

Mechanism of flow failure of ground both during and after earthquake was studied experimentally, in which the pore water migration was taken into consideration. Main results obtained from this study are as follows ;1) Volume compression characteristics of the sandy soil after the undrained cyclic shear was clarified. The volume compressibility is strongly affected by the degree of cyclic shear history. The relationship between the volumetric compression and effective mean stress was formulated. This result is useful for not only predicting the ground settlement after earthquake but also key issue for seepage shear failure.2) Mechanical shear failure property of the soils subjected to volume expansion due to inflow of pore water was clarified. This result confirms the possibility that the soil subjected to initial shear stress would be failed due to pore water migration.3) Considering the results obtained from laboratory elementary test, the calculation method for solving a boundary value problem was proposed. This makes it possible to predict the seepage shear failure deformation after the earthquake.4) On-line hybrid simulation technique was developed and it was applied to the practical problem. By using this technique, the deformation behavior of the soil subjected to optional volume change can be studied.The results written above will be appeared as a journal literature soon.

实验研究了地震期间和之后的地面流量的机理，其中考虑了孔隙水的迁移。从这项研究中获得的主要结果如下：1）阐明未排水循环剪切后沙质土壤的体积压缩特性。体积可压缩性受环状剪切历史悠久程度的强烈影响。制定了体积压缩与有效平均应力之间的关系。该结果不仅可以预测地震后的地面沉降，而且对于渗透剪切破坏的关键问题也很有用。2）阐明了由于孔隙水的流入而导致体积膨胀的土壤的机械剪切破坏特性。该结果证实了由于孔隙水迁移而导致初始剪切应力的土壤可能失败的可能性。3）考虑到从实验室基本测试中获得的结果，提出了解决边界价值问题的计算方法。这可以预测地震后的渗透剪切破坏变形。4）在线混合模拟技术已开发出来，并将其应用于实际问题。通过使用此技术，可以研究经受可选体积变化的土壤的变形行为。